Ugh, the winter! Why does it always feel like the growing season goes by way too quickly?! But not to fret – I’ve recently learned all about the winter sowing method and starting seeds in milk jugs during the winter, way before the last frost!
Even if you don’t have your indoor growing stations set up, you can still start planting! Simply plant seeds inside clear containers like milk jugs and gallon bottles for an early start on this year’s garden.
Winter sowing is basically a set-it-and-forget-it gardening activity to help us get through the long, boring, and cold winter. Just make sure your containers are getting some precipitation each week and you should be good!
What’s not to love?!
Gardening in winter! Mind = Blown!!
I’m so excited to share all that I know about the winter sowing method and will continue to update this post as things progress.
I hope you’ll join me – all you need is a plastic milk jug, some potting soil, and seeds!
Let’s get started!
What is winter sowing?
The winter sowing method involves starting seeds in milk jugs or other containers during the winter in climates that don’t typically allow outdoor gardening all year long. The bottle acts as a mini greenhouse, keeping the seedlings warm enough despite outside air temperatures in the winter. Natural precipitation such as rain and snow reach the soil and seeds through an open lid, helping them to germinate in the early spring.
When should I start my winter sowing seeds?
Knowing when to start winter sowing projects depends on where you live and the weather. Wait to winter sow your seeds until the freezing temperatures are consistent. Fluctuating temperatures that get very warm may allow winter sown seeds to germinate too soon. At the earliest, aim to wait for the winter solstice, December 21. For an even more enjoyable experience, make it easy on yourself and start winter sowing after the holidays, in January.
Choosing Winter Sowing Seeds
Finding the best seeds for winter sowing starts with considering your growing zone and what plants take a long time to produce.
You might also want to plant some flowers, even quick growers, so that you get a jump start on your flower garden.
Winter Sowing Seed List
As you work to figure out which seeds to winter sow, try looking for those that naturally lend themselves to this method.
- Cold weather crops, especially vegetables
- Easy-to-grow annual flowers
- Seeds from perennials – I’ve never tried this but would love to!
Generally speaking, look for verbiage on the seed packets that suggests the seeds will be a good fit for winter planting. Terms like “direct sow” and “self-sowing” are good clues!
Those listed as cold hardy or requiring cold stratification could also do well if winter sown.
And of course, perennial seeds would work too, since the plants can survive the winter, anyway.
Keep reading for more specific vegetables and flowers to try starting from seed in milk jugs or other containers.
Winter Sowing Vegetables
Consider which winter sowing vegetables you’ll be growing this year. I start by planting those that take the longest to make it through their growing season to harvest.
Winter sowing in PA zone 6, I plan to winter sow any that need a good and healthy head start, as well as those that are cold tolerant.
Some vegetables to winter sow in our area:
- Brussels Sprouts
- Collard Greens
- Kale varieties
- Swiss Chard / Rainbow Chard
Most brassicas seem to be fairly cold-hardy, making them one of the best seeds for winter sowing.
I also started our birdhouse gourds in a milk jug, but unfortunately didn’t get to transplant them in time.
Some cold crop vegetables you can plant directly in the ground as soon as you can work the soil. In those cases, I wouldn’t waste time winter sowing vegetables like that.
Herbs for Winter Sowing
Enjoy your herb garden a bit earlier this year by starting some seeds in gallon jugs. Here are some good herb seeds to winter sow.
- Summer Savory
Winter Sowing Flowers
Starting some winter sowing flowers is a great idea to get earlier blooms in your garden this year. You will love the pretty flowers outside and the ability to cut fresh flowers for indoors anytime you want!
Try winter sowing flowers like these for a quick and easy display of color all season long!
- Four O’Clocks
- Morning Glory
Hardy, hard-to-kill annuals like these make great flowers for your miniature greenhouses.
Winter Sowing Containers
Milk jugs, gallon water jugs, and clear orange juice bottles or lemonade bottles are among my favorite winter sowing containers.
Although, I suppose I would use other containers like plastic 16-oz water bottles, if needed, to really get enough seeds started!
Winter Sowing in Milk Jugs
Winter sowing in milk jugs is probably the most widespread container style. It’s easy to see why, based on the benefits of starting seeds in milk jugs.
- Easy to get
- Easy to cut
- Quick to build up a supply
This is a great place to start using the winter sowing method. Milk jugs may be the most convenient choice to grow this way for years to come!
Plastic Salad Containers –NOPE!
After seeing it mentioned on Instagram quite a bit, we tried the plastic shell containers from salad bars or bakery sections of the grocery store. In my humble opinion – NOT as good as advertised!!!
I will not be using these again, although I’ve seen some gardening posts where they did work out for people. Your mileage may vary.
Clear Juice Bottles
Seriously, go buy some Simply Lemonade, enjoy it, and reuse the container for winter sowing. That and the similarly shaped orange juice bottles are the perfect choice to create mini greenhouses for winter growing outside. A little harder to cut through, but the crystal-clear visibility is hard to beat.
Winter Sowing Supplies
All you need to get started is easy to obtain!
- Plastic containers
- Duct tape or similar
- Hot glue gun to melt holes – alternatively, poke holes with a knife
- Potting soil
How to Create a Milk Jug Garden
There’s just nothing like gardening in the wintertime. Starting seeds in milk jugs is a fun activity for the kids as well!
Try these tips to create a milk jug garden this winter.
- Gather empty milk jugs and other containers to use for winter sowing.
- Plug in a hot glue gun and use it to melt drainage holes in the bottom of all the containers. (Unplug when done!)
- Use a knife or other cutting implement to cut the milk jugs open around the center, almost all the way around. I stop at the handle so there’s a hinge.
- Fill the bottom of the milk jug with soil.
- Plant several seeds you wish to grow over the winter.
- Cover and lightly water.
- Tape the container closed tightly with duct tape or similar.
- Label the container with the type of seeds you planted and the date.
- Place the winter sowing jug outside in the sun, in a sheltered location.
- Repeat for as many milk jugs you like!
With a milk jug garden, watering may not even be necessary as long as the snow or rain makes it into the winter sowing containers.
Winter Sowing Maintenance: Weekly Check-ins
Growing plants in milk jugs over the winter is relatively hands-off, which is nice, especially during the colder months.
Still, you should check on your winter sowing seedlings and containers every week to make sure they aren’t drying out. Also check that the drainage holes are working and the mini greenhouses aren’t retaining water.
Make sure they’re protected from the wind and animals, too.
Watering a Milk Jug Garden
When it rains or snows, your seeds will likely get some moisture to help them survive.
Winter snow melting in northern regions like our growing zone 6b will add even more moisture to the mini greenhouses.
If you aren’t sure that your winter sowing milk jugs got enough water from rain and snow, you can lightly water them as well.
Check the soil by looking through the container’s opening at the top. If it is light in color or pulling away from the edges, add some water.
For soil that is dark and looks soft and smushy, you can probably safely wait a day or even a few days to check again.
Last year, I think I only watered my winter sowing garden two or three times. The zinnia flowers thrived!
This year I am excited to get an early start on herbs, vegetables, and even more flowers.
Get Started with the Winter Sowing Method
Try the winter sowing method to make winter less boring and get a jump start on your garden this year!
I will check back and update once I decide what we will be winter sowing for our 2022 garden. For now, I am pretty sure we’ll do luffa, birdhouse gourds, and zinnias again.
As long as my hubby doesn’t find my collection of empty jugs in the garage, I think we’ll be in good shape for a nice run at the winter sowing method this year!
Have you tried winter sowing yet? Do you have any tips to share? Or, if this is your first year trying it, hit us up in the comments with your questions!
Happy winter gardening!
By the way – if you like this post, you might also enjoy our post on Wet Paper Towel Germination!
12.28.21 – Updated to add link to more winter garden content.